I think the problem is that u are building 2 games one tower defence one bullet hell.
This way people that dont like tower defence wont play and the ones who dont like bullet hell also so ur target audience gets pretty small only the ones who enjoy both will like it.
The dower defence the linking is a nice mechanic! (but i dont like tower defence so..)
The bullet hell. I do like the added extra layer of gathering resources and biomes on the map more stuff to collect and actually do. The minimap was confusing to me though :P
Not working i guess is the overtime? i can stay up as long as i want i am not forced back. some of ur values have to grow stronger over time.
Sound is good reccurce progression also a great addon for bullet hells. so in each run u know u have to farm rocks first then iron and later crystals or other so u have to remember thair positions for later in ur run