Thanks a ton! Tutorials are my favorite part of RTS games because you can really feel the gameplay space opening up as you get through the early levels. Unfortunately I don't think the idea for the game is going anywhere because static defense buildings will always be limited in how much gameplay depth you can get out of them, so like you said it does feel thin. I have some ideas for what might make it more interesting but you're right about everything you said. Thank you so much for playing!