Interesting concept. I'd like to play more, but game ends when I build rocket. So I shoot like 10 bugs and it's the end... I thought there will be more targets :(
Anyway, my few suggestions about game design:
- as Imp said, block building will be very annoying in long run. No one would be able to remember all buildings, so player would need endlessly go look for recipe, place blocks etc, it will take a lot of time for not very interesting process.
- camera control is kinda very hard atm
- prob game balance should be adjusted, now you can place few factories and have endless materials.
- I think building menu should be reworked. Smaller icons, few rows, so that all buildings could be seen without scrolling. Also would be cool to have two menus, one for houses, factories etc and other one for turrets and walls.
Overall, could be cool game, waiting for version where I'll have enough targets to shoot them manually using every turret.
Btw, it reminds me old game Incoming(1998). There was a lot different vehicles(planes, tanks, helicopters etc) which you could control to fight aliens, but also there was strategic mode where you could build base. Maybe at some point you would like to add some vehicles which you can control, not only turrets.