Press the arrow in the corner to open the shop, and buy turrets from there. Press the play button and watch as your turrets shoot down the enemies! Click on a turret to view it's range. Press the arrow underneath the money counter to view special abilities used in battle. Spam green flag on startup because scratch is kind of buggy. Also if you don't have a God PC you might be cooked.
Credits: @ungamed123 for his project Absolute Defense, which I stole a few enemies and turrets from, as well as his project "defense gaem: the reckoning," which I took a few mechanics from. MODES: Invasion Hell: Every second onslaught will be an invasion. (65652) Abyssal Mode: A random effect (such as a dumbbell, a warp cloud, and a freeze cloud) appear every 1-10 seconds. (37234) Trojan Virus Mode: Ads appear every few seconds, with a few new ad effects as well. (67420) Lord Of Ruin Drakos Spam Mode: At the start of any given wave, there is a 1 in 3 chance Lord Of Ruin Drakos will spawn. (10066) Base Mode: Creates a base which can be clicked on to activate random effects, also has some passive effects. However, these effects eat up some entropy (10 for passive, 50 for non-passive). (29905) SECONDARY MODES: Hard Mode: All enemies are buffed by 50% more than they normally are. (12827) Impossible Mode: All enemies are buffed by 400% more than they normally are. (81503) Wave Mania: Random wave attacks appear with various effects that debuff turrets. (93546) Dark Mode: For those who want to be reckoned with. (71418) TERTIARY MODES: 4 Crown: You may only use the turrets Single, Warp, Quattuorvigintuple, Chaos, and Mortar. (41944) Random Special: The special abilities you may use are randomized, ranging from being able to use all but one special, to all specials being unusable. (77307) 8 Crown: You may only use the turrets Single, Quattuorvigintuple, and Chaos. All enemies are 30% more buffed than they normally are. (81988) Air Strike: Randomly, a large quantity of mortar bombs will rain from the sky. Enemies are 300% more buffed than they are normally. (03316) MODES ARE NOT RECOMMENED TO PLAYERS WHO HAVEN'T BEATEN THE ORIGINAL CAMPAIGN