Hello fellow small-cute-heroes fan ^^
I died on wave 5 ! XD
Nice game, I like the gameplay. It made me think of classic top-down roguelites/shoot'em'up, and I didn't encounter a single bug. I got blocked once by trees when trying to get some ammo, I'm not sure it was intentional and I think it's just how the objects are placed.
I liked the tension of fighting + handling the bomb with a code that gets longer as time goes.
As others have said, it was maybe a bit too difficult, or I would have appreciated easier first waves and a more gradual increase in difficulty.