Thanks a lot, I'm really happy how well this game was received :)
I agree with your (and others') points. I think I will make 3 updates to this game as I want to keep this project rather small.
1 - UI rehaul (I would prefer choosing what to build from a list of recipes and then placing it in proper slots in the world)
2 - fixing the mana gathering to avoid this dull waiting for the right mana moments
3 - content update with soft resets that allow you to keep meta upgrades.
Then it should be a complete experience I think