Wow, definitely a great game! Way beyond what I was able to do. LOL I'm not worthy of a review, but would appreciate any constructive feedback as I can see you have a lot of experience doing this.
So, where to begin, the controls were great, I did feel in control. That said I am not normally a keyboard game player so getting a hang of the buttons to press for me was hard, I kept wanting to hit jump instead of fire and fire instead of jump, but that's a me issue not a you issue. LOL
Love the menu screen and all the visuals. A great deal of love was put into this I can tell and SO fits the Gameboy Soul! Wish I was playing on a Gameboy (or at least a gamepad) as I feel like I'd be able to fully take in the game. The sound and music were making me fondly remember the old school Gameboy I remember. I still have my Gameboy Advance SP, wish I had the OG one though too.
Enemy AI seemed spot on too and a great variety of levels, though me getting through them all will likely take longer and I REALLY want to rate and comment on as many games as I can.
Thank you for making the game, was a blast!