Maybe you could consider adding other work-out stations in the future, turn it into a full weight room instead of just a bench press. Your guy could keep his upgrades and make upgrading the other equipment easier, gives us a little more variety. Solid idle game, though.
Skills active when you get a crit. Heal will give you some life back, Fire will do damage over time, and Ship has your ship fire a cannon ball at the enemy.
It'd be nice if it were more clear what the weapon upgrades actually do.
Also, this game invites way too many comparisons to Binding of Isaac, which probably isn't a good idea when your game has nothing of what makes Binding of Isaac so replayable and unique.
You really need to develop a game more than this before you release it. Continually evolving games are cool, but you need to have way more of a foundation if you want to develop a following large enough to keep people interested as you update it.
What do you mean?