Click the menu on the top to open the shop Place towers to try to prevent the shapes from reducing your life area to 0 (the green area). Towers cost parts that spawn on the map. Click on the parts to pick them up. There is no end to the game unless shapes stop spawning; just play until you don't want to anymore.
I started working on this game in 2019, but it was super glitchy. Now 3 years later (!) I have significantly lower standards and am posting it anyway! HAPPY 5 YEAR ANNIVERSARY ROCK TOWER DEFENSE YOU DESERVE BETTER THAN THIS Music from OrangeFreeSounds, sound effects from freesound :D