Thank you for playing and thank you for the feedback!
Those powerups on the picture are mainly for endless mode to have something to spend the money on, that would still give you the edge over the enemies that are scaling in strength after wave 10, which is the last intended level of the game. I should have been more clear in the description, or give some explanation on things after the tutorial. So because you can only have a limited number of poles, you cannot spend your money anymore, that's why the powerups are in the game. One other thing is that the game was intended to play faster, but feedback from testers was that it was too hard, that's why the gamespeed only creeps up after waves, which can be turned off to have a more challenging run. If the game would be finisbed it would have more difficulty levels anyways. Other powerups were not added as they could be achieved with pole upgrades, like your advice for a freeze can be achieved with the glue->sticky air branch. I'm sorry for the music, it wasn't intended to be a game music, it was only a piano piece i wrote some time ago, which i thought would fit. I felt like the song made the game silly, but based on your and others' feedback, it was the weak link of the game. And yeah, more enemy types would be great to have, i agree.
Anyways, thank you for playing, and for the feedback! :)