This game felt like the prototype of a real game! And I mean that in the best way possible. The pixel art was well done, especially the characters. The music and sound effects were very nice! I enjoyed the various characters that were in the game, especially the old man who just doesn't give a hoot, haha!
I think I reached the end, though I'm not totally sure. The area with tons of enemies right after Mr. Cool Dude took my oddly shaped coins? I tried to beat that a few times, but having to go through the previous areas when dying made me stop trying after the 5th try, sorry!
Speaking of dying, the death effect was nicely done too! All the feedback mechanisms in the game were very well done. Good sounds, screen shake, the hit numbers that pop up... they're all put together very cohesively and felt good!
I enjoyed the fourth wall break from the Mr. Cool Dude regarding the theme!
Seems like the green suit was given to you without mention due to time constraints, or that's my assumption. Kinda of made it the default weapon in the last area, but I kind of liked that. I think that area would have been a lot harder without it, due to the sheer quantity of enemies.
I had what seemed to be 1 or 2 minor glitches, but nothing game breaking. One of the enemy spawning chimneys kind of drifted up and away while spinning, which was really funny actually. And one time I seemed to get stuck for 5-10 seconds on a black screen after dying and some damage numbers were popping up.
I can see a lot of work went into this, and it felt really good to play! It was a really well-rounded submission. You guys did a great job!