Hi Lewis, thanks for leaving your feedback!
Glad you enjoyed a few runs with our game - we are aware of Islands & 4 Seasons being a bit simple in terms of player-choices, as you unlock everything other than Harvesters & Towers Level 1 only after a couple of waves, if we revisit our maps that would definitely be something to keep an eye on. Regarding the lack of tutorial / tooltips, this is something we learned now! For the Designers - who obviously understand the systems - it all feels very natural and maybe even super obvious, but how would someone else know that not bulding a Harvester - or building said Harvester on the center tile wave 1 - would put you in a dead end? Once again, thank you and we have some ideas to work on tutorial, more maps, map generation, different races to choose from, other enemies... eventually we had to make the cut for scope reasons!