This might be the longest time I've spent on a submission so far. Completely lost track of time. I love the gameplay loop, the upgrades take awhile to get but they feel so rewarding. The idea of randomized upgrades is cool but It took a really long time before I saw the first carry capacity upgrade which is something I kept hoping was a thing so I could make less trips, and then it took even longer before I saw carry capacity 2.
In the beginning it didn't feel worth it to participate in the defense phase of the game because I felt like I wasn't getting much more back after buying turrets, especially without having any upgrades. So I started just time jumping immediately and just using my gather phase resources on upgrades for a couple loops. This wasn't an issue but I wonder if it was the intended experience.
Anyway I had a ton of fun with it! It's really impressive what you achieved in 10 days. There's a lot of complexity going on here, it feels like 2 or 3 games-in-one. Amazing job!