Thanks a lot for your detailed feedback, we want to continue working on the game further so your feedback is going to help us a lot.
* The time pressure was mainly for the jam's theme so will definitely be re-looking at the wave timers etc after the jam.
* Agreed with the upgrades need to feel bigger, going to look into that
* The goblin was unfortunately bugged, once he is scared off by an enemy he never returns, he was supposed to come every 2nd round
Thanks again for your feedback
If you want to follow development of it feel free to join our discord for the game where we will post the updates on the game.
https://discord.gg/Ayep4HMP5u