Damn this was actually quite nice. Issues first: the music was a bit too loud (although amazing), so it would be nice to have a settings menu and volume slider, the controls should be somewhere else instead of at the start of the game (just my opinion), and the difficulty was also the same, and collecting coins didn't seem to have any purpose.
Still, the music was really nice (genuinely fits the theme xD), the graphics and visuals were nice (although yes you did use assets and i could tell that some were from brackeys, but that's fine), and the menu text and stuff were nice as well. Also I guess the comments before were saying the controls were weird because of the V to shoot, but it's not really a big problem to be honest.
Overall, nice fun game, with potential for more fun levels!