The charging mechanics get annoying when you have a lot of towers. Also, speeding up the game shouldn't speed up the bonus reduction timer. It feels awkward to keep changing speeds between planning defense and spawning enemies. If you want to keep it this way, consider adding keybinds (1, 2, 3) for game speed.
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Thanks for playing and feedback! Good idea with the key binds. For charging I was planning to make it so its a radius around cursor which grows over time so that later you can charge more towers at once.
The speed up suggestion I’m still not sure about. We had a lot of discussion about this internally. We didn’t want to have different game speeds at a disadvantage.