There is supposed to be a circle on the trap when you are playing them (red/green depending on if it can be placed there). Its not showing up for you? Unfortunately the second level is bugged. This was reported by many people and I can reproduce it as well. Its been fixed since then and we will upload an improved version after the game jam. Thanks for playing!
Viewing post in Dead Raiders jam comments
That circle does show up for me, but just that alone I feel isn't quite enough in most situations. Without a clearer indication of the raiders' area of prevention, you have to physically check where something can be placed instead of just being able to tell by looking, which takes a lot of time in a game where quick thinking and action is key to success. I kept trying to place traps, only for the raider to block that tile the moment I actually clicked, and it felt a little frustrating :(
I'll have to check out the new build when it drops!
Since then I removed the circle and took a completely different approach (in the post game jam version) where the tiles you can place traps on, become green while you have building mode activated (after selecting a trap on the UI), and the ones you cannot build on because of a raider being too close, becomes red instead of green. This indication stays active and continuously updated until you place the trap or cancel building mode. Does this sound better?