The enemies felt a bit slow at first, but as soon as they got past my defenses, I was glad they moved slow enough to panic place new towers
The only balance issue as far as the towers are concerned, I thought the ringed planet felt a little underpowered until it was upgraded. I used a lot of the asteroid belt, but it didn't feel overpowered in my opinion
The elemental aspect was the most confusing part, it wasn't clear what was good against what element, and I didn't know what elements there were, the only thing I discovered was that fire or solar enemies were hard to deal with
the UI is absolutely fine, concise and makes sense
I have one problem with the tiered currency, in that there is no way to exchange the lower ones for the higher ones, I found myself just hoping for a black hole piece and drop rates were screwing me over a little bit
The wormhole tower was a godsend, it made things feel so much better, a possible upgrade should you want to add it is a range upgrade