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Thank you very much for playing and good job getting to wave 29!

It's unfortunate that you didn't get to wave 30. If you remember, I would have loved to know how many attempts did it take to get there.

After the first game jam, I added the "heavy" upgrade as a test solution to the bounce problem. Unfortunately this upgrade was so very op  that it would crush all enemies without much effort.
As a solution to that I added the "leftovers". This makes it harder to just rotate around the margin as pushing leftovers towards it makes the player risk getting damaged.
While the game is more balanced now, there is still much space for improvement indeed.

"All enemies always fire at the same time. Not sure if this is good or bad."
=)) Yes! I hated this when I first created this type of enemy. In the first jam there wasn't enough time to address it. Now, I do not know what to do with it. I looked at other games as well and it doesn't seem like they "fixed" it, its just that the player has so much to focus on, that it is not really observable.
It will probably stay how it is...

On top of being hard to balance, the game has a sound problem as well =). There isn't that much variation that can be added for sounds. 
Pop pop pop... , did considered to add screen shake when player gets hit. Tho I do not like screen shake that much, and with the current bouncing trouble it could end up really shaky as well =D.

"Make everything explode immediately without that pause."
Ah, yes. That is a "bug" in the sense that I know why it happens, it was not really intended and I had to settle with it.

I would argue there is a better dominant strategy than the one you mentioned.  I do hesitate to say it, as it makes the game a little bit too easy. 
Here is a useful tip in case you give it another try sometimes:  always get the damage upgrade.

Thank you again!