Thank you so much for the feedback <3 I agree, should've been more clear on how the controls work. Maybe I'll add it on the itch page - the whole intro stuff was made in a rush towards the end, and I was just happy it worked and I didn't brick anything :D
Regarding filesize - yeah I was pleasently surprised. I watched a tutorial on that, but there wasn't really anthing new to learn there - strip all unneeded plugins, don't package Starter Content, only package whitelisted maps etc. - what also helped me certainly, is that my biggest assets were like 96kb wav files, since I only used basic engine shapes etc. :D
All the best to you too :)