Hey! :) Really enjoyed playing your game and I can only chime in with camelezards critique. I also immediately forgot about the space key and wondered how you're supposed to defend for longer than a minute. So once I remembered you could do something with Space, it made a lot more sense haha :D

I wanna add the following critique:

• The character controller feels nice and smooth. I was confused by the attack indicator, however. If you show a circle / wave like attack visual, it does convey an AoE attack. So I thought I was able to hit multiple enemies at once, which is not the case
• If you stand near a material and try to attack an enemy, it sometimes prioritizes the material pickup (I think it's position based, so the nearest interaction element gets chosen, right?). So either having two separate keys for attacking and interacting/pickup, or allowing both the pickup/interaction and the attack to go through with one click would solve the problem :)
• Also, idk if it's a design choice or not, but I feel like you should be able to pick up more than 1 material at a time, or at least make it so that if you try to pick up a material whilst already holding one, the material on the ground doesn't get destroyed. The way it is right now makes the player feel like he's doing a mistake every time this happens.
• Personally, just from looking at the thumbnail and main menu, I was expecting some satisfying sound effects and a chill synthwave-ish music to go along with this. I think it would make the game even more addictive, so please let me know if you're planning to add that!

So overall a great submission, especially for a 48 h hour jam. Awesome work! :)

hey there! Guess what? I've also programmed on GMS2. I know it's not easy to do pathfinding, so congratulations! Your game is fun and there are some points you could improve.

• Controls: Having actions and movement shared between mouse and keyboard can work, but having mouse interaction and another action on space isn't practical.
• I like the idea of building small towers to defend against monsters of different colors. It's a great concept.
• You should make it clearer to the player that they can create towers by pressing space. Personally, I noticed it after 3 runs. 
• I love your game! Adding some music would have been great to immerse me more in defending my base.
  
  Keep up the good work; I really enjoyed playing this game. <3