Yeah on the first level it cannot be clear enough sometimes how much you can push to the left/right to dodge stuff, but that is why the player hitbox was made smaller (you can even go through the tiny gaps of the obstacles as well!)
Second, the big rocks die instantly with a missile but drop even smaller ones (plus pickups!). Missiles can be a bit tricky to use because of how slow they can be and the final boss was a bit too much for sure jajaja. I remember testing it before putting the final version and being even HARDER, thing is we wanted to leave a decent challenge for people that reached the end ^^
Third, yeah depending on your screen/resolution it could even be harder or easier to see stuff. Some of the text specially was impossible to make readable because of how far it is from the player (like the ones used in the final boss to indicate the weak points, good thing I did a decent design with a damn big arrow).
And lastly, the soundtrack is incredibly GB! It even runs on real hardware, search on twitter if you can @DonutShoes (or in the jam page). He did the music and it's an incredible talented chiptuner.
Thank you a lot for taking the time to do such a well written and explained review of our project. Have a nice day <3