Hi!
Thanks for taking your time to play, and even leaving a comment!
I definitely agree about everything you've mentioned here, at this time I kinda rushed to add more "levels" with some "boost" multiplier to test it, and the whole system to unlock more levels, etc.
I will definitely try to make it more rewarding to actually play tougher levels, maybe even having some locked skills behind unlocking certain levels too, I will figure it out.
Thanks again for playing and commenting, it means a lot to me.