It's a wonder the Iron Man copyright holders haven't sued you (meaning dev) for using a SIMILAR suit to iron man's. ;) (well one of them...) Also... Iron Man + Monkey = Iron Monkey? oO
Did you notice that you act like one of the monsters while traveling through the labyrinth? Don't notice it's tile-based and you can only go a predetermined path, while getting attacked from all sides? There you have it! At least it's more fun than getting killed, respawned and then killed again, over and over again...
Traps always go nicely with slow and/or shock. Endgame tower gems however limit your choice to Chain Hit and Multiple Damage, as they are the only ones standing a chance in the long run. This even excludes Chain Hit, if you are able to kill all monsters fast enough with just Multiple Damage Gems. A valid endgame strategy is always to amplify a single gem to max efficiency, at the start it's even better to just build amplifiers and put in grade 1 gems rather than upgrading them, despite the seemingly higher cost of building them.
Speed Up Tip: Alt-Tab to another program, without rendering the game, it runs at max fps, this makes it much faster when more than 100 creeps are on your screen at the same time.
The balancing needs a serious fix... while huge battleships are completely useless and costly, building masses of fighters owns everything, especially with "fighter" and "bomber". Currently this can be seen as protip also. :P
Hm... bit disappointed that the whole Journal can't be read on Finish Screen, in the right order... as it's pretty messed up if you read it ingame. But all in all a very nice jump'n'run game... even though i don't usually play them (not much at least).
It seems there is something VERY random about MMT, even if built with exactly the same materials (basic towers), their stats can vary greatly each time built.
Easiest way to beat None-Ghost levels: Place 1 Area Burst Tower (make a small maze with cheap towers of course), rush Mob Sending, use excess money to quickly upgrade it + boosting with Boost Tower, best to start with Fire Rate, while Range works awesomesauce after fire rate was build. Also recommend buying "only 1 mob type"-modes, to quickly amass experience.
Found the final boss after exactly 30 bubbles from center, it's surely random for each game played, but... at least that gives you an idea. ^^ Also if you doubt fighting the final boss: he spawns smaller mobs, has several atks, one of which is an battlefield wide random-bombardment and also his size that clings to about half of the battlefield should give you an enormous hint. - All in all, a really laggy battle, i must say. Just as using any good combination is extremely laggy in itself (even the developer deployed tanks fit in this category oO).
There is a serious bug with repair drone - instead of healing player & base, it only heals base. The base seems to lose 1 hp all the time, without enemies being around, making the drone stay there and needlessly repair (while the player might die, from not using instant repair perk).