Tried the game now! Just great. Best Manic Miner game style I have tried.
First of all very nice game play! Clever level design. What you have done with practice and locked levels is clever and needed if people will continue to play this kind of game in 2026. Password system also great idea! High-score save would be nice. I think the "air left" take a little to long to finish after each level. Playing on real A500 there a a little stutter at times. Not something that disrupts game play but had to mention it.
I think you need some help with that classical music. Both instruments play exactly the same tones. I can help you if you like?
I will not change the music just make the 2 instruments more interesting. If you send me the samples I can show you what I am thinking and if you like it use it, If not. do not use it ;)
I will for sure buy the full game when finished. Keep on the great work!