A decent idea and execution, but I don't like that the upgrade menu doesn't respond to scrolling, or that clicking and dragging counts as pressing a button, so you might accidentally purchase something while trying to see what the other upgrades are.
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Thank you for your feedback! I will update the game after game jam :)
Mouse scroll should work (at least it works on my side). If you would like to share more info for investigation: what mouse are you using (traditional or some specific configuration)? Which one browser and OS? Thank you in advance :)