Kinda like metroid
What I liked about this game was that despite it's rather simple design, and simple graphics, the game itself was still a ton of fun. The game in general is fun. It has that nostalgia feel to it, And overall a fun and differant kind of game at times, you added some interesting style to it. This game was fun, kind of reminded me of the classic NES metroid the graphics were dark and showed good detail good shades, the Music was pretty impressive and was very fitting to the gameplay, the gameplay itself was notbad at all the controlls could use more smoother feel and such, and the medals was a nice addittion, so overall a fun and entertaining game. The screen was not exactly small but things could be slightly larger like the coins were kind of small kind hard to see at times. Thankfully, I type long-winded reviews so that willgive me some insight on more to address about your style and game type, now its upto you to take that advice and run with it and if i do suggest any ideas to make them fit and work somehow.
~~THINGS TO IMPROVE ON~~
They say time will make for some better pieces of workand you have for sure shown that, Adding some extras wouldnt hurt either, so try some new things, try different things, try some new possibilities, here is what i came up with. So first off maybe make the screen or canvus somewhat larger, because things were kinda too small like the coins.