The concept of breaking blocks after you've been on them and having to break all of them before going to the next level is quite interesting, but the controls were so hard that it was tough to get through the levels. I love the fact that you actually made the music yourself when so many others just take stuff from online, but it could have used a more typical "harmony + melody + bass" logic to feel slightly less random, and using another instrument would have already just made a massive difference because this synth can sort of destroy your ears if you listen to it for too long aha.
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Indeed, but if you listen to some retro game themes, you'll notice the synths they used were a lot less harsh, and still followed baselines of music theory. What program are you using for music? If you want to learn a bit about making retro music, this video can be really useful:
Undertale's soundtrack manages to sound retro by using soundfonts in FL Studio, and it produces an absolutely amazing end result! I'm not saying you have to copy what he did exactly, but it can be great for future experiences :)