Just a few suggestions

[Legionary]

This is currently my favorite Tower Defense game. There is a couple of frustrating things I found. I play it while watching stuff on my other monitor.

1) The challenge to keep the enemy 5 spaces away form the tower I think would be better if you could code it so it its 5 path steps from the fire. Some maps that you are kind of forced to have it spiral from the fire you can just build far away. and makes its impossible. This isnt on every map but just on a few.

2) Allow you to Toggle off Towers for selection. Having a challenge where you arent supposed to use certain towers would be easier if we could just toggle them on/off. I know we could just take them out of the line up but just for user error purposes and new players. A simple hold click a tower locks and you can unlock it anytime. More of a Quality of Life patch. I often play while watching youtube and sometimes forget I'm doing a challenges.

3) Add 2 more infinite/endless modes.
a) You choose the map, you select your starting towers/blocks like a run, you select difficulty and your person, and every 2-3 levels you get to choose from random options like market, towers, relic, etc. And at this time you can also swap towers in and out of your pool.

b) endless runs of the base game modes. have it mix up the maps and aftrer a boss it starts up a new tree. Things scale as each time you start a new tree.