Right now you might want to bump up stamina recovery rate, or cut back the area costs. With maybe 12 stamina an hour areas costing 25+ stamina represent 2 hours of waiting for maybe 5 minutes of playing. You won't get much feedback with that rate of play.
needs a some more work to get it polished up, the camera shifts are slightly annoying, clipping through things is a pain, and pirates need to be adjusted.
Three things need to be done to make this game decent:
1: Slow down the difficulty curve, the enemies ramp up way too fast.
2: Reduce level times, my finger hurts at the end of a 3 minute long level
3: Add hotkeys for spell, because right now they are not worth the time to click on them
Nthing the comments on having the AI scale independent of Upgrades and I would also suggest not having the AI spawn everything at the same rate and have units return some resources when they walk of the map and do something about the spell crystal overload deal.
Life pills need to grant more health at later levels. 300-500(maybe 10x'ed) health (maxed support) doesn't help much when boss does 1000's a hit and you have 10000+ health.
Excellent suggestion, we just cut the stamina recovery time in half. Hopefully that will help a little bit.