Interesting idea, good implementation! The game looks nice.
When I chose the new abilities for bullets (reflection from walls), with a large number of bullets, there were a lot of sounds that even drowned out the music.
Next, I will describe my proposals that came to my mind, but these are just my thoughts, do not take this as a complaint or criticism.
Offers:
- limit the areas where to install new towers, for even distribution;
- increase the round time while advancing;
- increase the number of installed towers while advancing (for example, on the 5th round you already need to put 2 towers);
- make the main character more expressive. In general, I would like to increase everything in the game in size, fine as it seems to me;
- to develop the user interface, now you need to deal with it (understand and read);
- the music is beautiful, but for my taste it does not suit the gameplay, it suits the menu.
Suggestions for new abilities:
- time dilation;
- "clone" - install a copy, and the enemies begin to aim at the nearest point, the health of clone 1, so you can temporarily deflect the attack from yourself;
- add one-time abilities (can be used once per round) - vulnerability for 2 seconds, the same "clone" (described above);
- "shot" - the ability to attack towers.
Good luck! =)