Excellent game! I thoroughly enjoyed playing through it, despite it being frustrating when you're like: "Oh yay, new research! GARR SO MUCH RESOURCES NEEDED!", but it was still very enjoyable. I beat the game and I maxed all my sub-systems but I didn't get the medals for them. No matter though. Glean is definitely in my top 10 favourite flash games I've played as it was quite rewarding and addictive as you progressed further and gained more research and upgrades.
The only real part I didn't like was that area of the game when you were unable to go too deep underground, despite needing what was down there to upgrade and not having the necessary research to get the other upgrades you need. It really slowed down because there were those 1 or 2 things you REALLY had trouble finding.
Anyway, good game! Keep on making awesome stuff!
Lewej-Onics.