The game is very pretty and I loved the aesthetic. The colours and sound really worked well to create an authentic retro-inspired metroid-esque experience. The stages were well thought-out and the character design was very appealing - both for allies and enemies. The game is cute af.
The gameplay consists of running around, jumping and floating your way through side-scrolling, colour-coded areas. There are various puzzles and battles are played as RPG-esque in that you went to a separate 'realm' to engage and destroy the enemies instead of shooting them on-map. This, I think, was a good idea.
Your skills were useful and interesting, and having to play timed minigames was a nice change from just inputting commands. One thing I did have issue with, however, was how floating/slidey the character was when jumping/landing and issues with moving blocks causing trouble with trying to jump to/from them. You'd slide off the edge of the block easily or couldn't jump at all on certain blocks, making some parts of the game more frustrating than fun. Which is a pity. Nail that issue down and the game will be great, though.
Overall the game shows a lot of promise, taking an old idea and giving it a fresh perspective by melding it with another idea and tweaking them both to fit. Also bunny girl is best girl.