If you find the screen too small just zoom in with pressing ctrl and + at the same time. Besides using + you can also use the mouse wheel to change the zoom level.
After zooming in, you can press F11 for full screen so you can zoom in much more and be able to see the entire game fully without any obstruction by the task bar, favourites bar etc.
Reinforcement points refers to the points you use to summon friendly units into the battlefield. Guard points refers to the defence of a unit,which affects its ability to take damage (enhancing its survivability). Recover time refers to the time it takes for an injured unit to heal itself over time. Respawn time refers to the time it takes for a dead unit to revive itself. Aim time refers to the lag time it takes for a unit to target enemies within range. Reload time refers to the time taken to reload to a fresh clip after discharging the ammunition of a clip completely. Sight distance refers to the range it takes for a unit to be able to fire upon an enemy unit. Projectile AoE refers to the area of splash damage whereby enemies within the zone would take damage. Armour piercing refers to the ability to deal increased damage to enemy armour (and other vehicles). The 3 star upgrades for the attack helicopter and the bomber increases the overall area being targeted.
Getting multiple instance of a special ability makes it better, yet it depends on the ability what that means, only for few it means less cost.
For example, curing makes more purple tiles turn into cure stones, Stunning extends the stun duration (more turns that enemy cannot attack), etc.
For those who find themselves constantly lagging in the animations, you could lower down the quality by right clicking the game, going to quality and change it to low or medium quality. Hope it helps =)
@MiahTheStormWolf: For your bug with Kingdom Rush Frontiers, go to http://www.kongregate.com/feedbacks/new. Under the drop down list for Message Subject, select Report a Game Bug. Follow the instructions and search for Kingdom Rush Frontiers under Game. Then key in your description of your problem. You can also choose to upload any screenshots of your problem. This is far better than only posting on the comments section as the game developer would have a formal report of your bug and really look into it. \\\ For info on how to take and save the screenshot into an image file see http://www.digitaltrends.com/computing/how-to-take-a-screenshot-on-pc/.
To make sure your game progress is saved, right click on the game and select settings. Then click the 3rd icon with the file to access local storage settings. Thereafter, drag the cursor all the way to the end(to the right) to set local storage as unlimited. Then close the window. \\\
You also need to set your global storage settings. Go to http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html. When you are at the page, make sure the checkbox for "Allow third-party flash content to store data on your computer" is checked.
If the above steps do not work, it could be that that you have registry cleaner or cookie remover programs installed on your computer. These programs are probably set to delete that information every time the computer shuts down. In this case, check your settings for these programs or simply uninstall them. \\\
You do not need to follow on facebook and twitter to get the stars. Just clicking on the respective icons of facebook and twitter will give you the star already. Following is not mandatory.