I'm a big fan of the upgrading system, the enemy waves get a bit overwhelming but I feel like that adds to the game! Only thing is that it took me a minute to realize I should go to the edges of the map to find upgrades so I feel like placing them closer to the middle would make them more of a focal point. Great job overall
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Glad to hear that you liked it.
I intended to make the upgrade spots at the corners clear with the minimap where they are marked with bright blue, and also mentioned them in the game description under "Tips". Still, feedback taken. I think I could've done something like popping up a notification that points to the nearest corner once the player had enough gems for an upgrade.
Thanks for your time playing and sharing your feedback :)