It's not super easy to put together even a simple survivors-like, so well done. On the downside, the roads, and the world boarders, were very much just suggestions. I guessed at a way to get AOE damage, and doing that carefully was enough to get me past the difficulty curve into infinite winning - breaking a bunch of stuff in the process of course (attack speed always seems to struggle at high levels if you aren't expecting them.) Without that, the game tends to end pretty quickly, because you don't seem to be able to keep up with enemy scaling for long at all.
Quite like the enemy art especially but it would be nice to have animations of some sort for this type of game. Numbers going up tends to be a nice incentivizer in general, but only when you actually have periods of being strong, which isn't much of a thing if you try to play normally.