i think it's nice, but i have a few critiques:
1. at the start, it 's way too slow, mining ores takes too long
2. the player's move speed is annoyingly slow, going anywhere feels like a crawl especially in a game where you need to move so much to find the connection points
3. the extender's range is too small, it's annoying having to chain them so much
4. not being able to actually see the connection range is annoying
5. night time doesn't feel like too much of a threat, the enemies are too weak and there are too few of them and the turrets are too strong
6. scanning mode doesn't really have any downsides, making it so there's no reason to not have it constantly enabled and scanning
7. when you have a lot of towers placed, it really starts to lag, i assume it's because you're checking for connections every frame (?)
8. (small one) the time left when you're outside of signal range has way too many decimals, 2 or 3 are enough (just doing time_left = snappedf(time_left, 0.01) is enough)
but overall, i still like it! it's a nice game