Great submission! I tried upgrading my towers in the beginning of my run but they kept getting destroyed by the red guys so I moved on to the strategy of spamming towers everywhere, and this worked quite well. (and then I unlocked more towers that helped with defeating/ignoring the red guys). The red guys could even kill my towers from off the screen! I wish there was more of an indicator to the player about which towers they can afford to build.
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Thanks for playing and the feedback.
You need to use a longer ranged tower, such as the starting catapults, to deal with the red guys. Putting some of them near other towers, especially the shorter ranged ones, can help. The catapults also get range upgrades, which help to deal with the threat from further away.
We did acknowledge them attacking from off screen and tried adjusting the map so you couldn't put your towers too close, but they have long enough range it can still happen. If we develop further, we will rework the map and their range to try to force them onto the screen before they start to fire.
I wanted to highlight the related resources when a tower is selected, and show the number in red when lacking, but ran out of time.