As I've stated before, I'm a sucker for old-school platformers from the 8/16-bit eras. Thankfully, this game scratches my everlasting itch for games from those classic times. It even has that Kirby's Dream Land feel, which is a guilty pleasure of mine.
The gameplay is pretty good, although I would like to have seen a time limit or score functions. The graphics are well-made, the music and sound effects on-point for an 8-bit style game. The controls are a bit odd, specifically the jump button (which made my ring finger cramp. Controller support or use of WASD for movement & other keys for jump/attack/bag (JKL, for example) would've been amazing.
The only thing I have steep criticism for is the death transition. It's WAY too fast. I barely had enough time between my final hit and the title screen to process that I actually died.
Despite everything, this is still a pretty good game. A little bit of tweaking and this will feel exactly like a Game Boy game. Superb job!