13.05.2025 
Added
Levels – after 3 minutes a boss spawns that when killed unlocks the next level. Each level is a bit harder but gives more rewards.
Few new upgrades
Small UI improvements

This is most likely the final submission before the first deadline.

The game is fully playable without any issues, but there are still some things that could be improved. Mainly the game balance such as upgrade costs, enemy spawning rate, speed or health. There's also no final goal or a way to finish the game. 

Additional possible things that could be added to improve the game quality:
More upgrades
Better UI for the upgrade menu
More ways to obtain currency
Actual settings (mainly sound volume)
Being able to pause the game and access settings while playing
Saving and Loading the game data