when you get enough galactic credits you can click any key to open a shop menu for summoning defences click P to pause (do this before opening shop) down arrow to unpause if the crabs meter thing reaches 0 you lose and the game restarts there is no save yet (need to youtube how to do that lol)
I came up with this game while playing "Adventure Time (trademarked) Bloons TD(also trademarked I'm pretty sure)" on my phone. So I thought creating one about aliens and crabs would be kinda funny please comment any bug you find