Thanks @karidyas. All your suggestions are valid.
- Yes, ammo sounds are muffled. I tried to keep them low, so that the rhythmic beats are more prominent than, random gun fire. I've also considered instead of using standard gun fire impact sound, I could use a more pleasant chime sound. Not sure if that will go well, but might try. What do you think?
- I agree that menu Tower menu options get in the way. I'll consider adding a flag in settings that will let seasoned users turn off the menu display and only use keyboard shortcuts.
- Yes, valid point. There was some visual feedback on tower build with no resources, but I removed it temporarily. I'll add something better soon.
Added 3rd level today, with new enemy and new tower. Give it a shot!