Hey, thanks for playing!  The line you draw is made up of many small segments stored in a list.  Each time a new segment is added to the list, it's compared against every other segment that came before to see whether they intersect using "funky math stuff" (parametric equations, it's actual magic to me).  If the math says they intersect, then the coordinates of that point are added to a list of pending intersections.  If the mouse moves a certain distance away from that point with left-click still held down, then it locks in that intersection and draws a star to indicate it registered.  When left-click is released, the number of stars are counted and that's what determines which spell is cast.

I added the pending system as a sort of "dead zone" to prevent unintentional crossings when the end of the line just barely crosses over the start of the line, but it's less effective if the loop is drawn very large.  That's why I'm planning on dynamically changing the dead zone distance based on the total length of the line after the jam ends :)  Hopefully, that'll help make the detection more accurate.

Thanks for the comment, happy you loved it! Do you mean that the camera was too slow to catch up to the players movements? I'll try to fix it after the jam, thanks!

Thanks! We'd wed really like to add a bit of polish and the 4th spell after the jam wraps up. We ended up working on it pretty much right up until the deadline

Thanks for trying it out! In our next iteration, we want to try and make casting a little more forgiving based on the feedback we got.

Thanks so much for playing!

Thanks for the feedback! I tried a few different ways of detecting the number of loop crossings, but there were pros and cons to each method. If I can find a better way of doing it that works in most situations, I'll update the game after the jam!

Thanks so much! Ya, the rock felt really satisfying when we got it in and had it squish the zombies :)
We would have loved to do a 4th attack but ran out of time. maybe in the next iteration

We were really happy when we figured we could change the damage of the boulder to one shot the zombies and instantly squish them, it felt really good :)
Would have loved to have a squish sound effect if we had more time 

Thanks for checking it out!  I'm glad to hear you liked it :D

Thanks! And ya, good comment on the spell order swap. The shield helps to block some zombie attacks too, but it feels way better to block projectiles.

Hey Freddie!  Thanks for playing our game.  If your circle wasn't registering, it might have been because the end of your line crossed over the start.  Your drawing must have 0 crossings to cast Fireball.  If you saw a star appear over an intersection, then the game registered that as a crossing, and it probably thought you were trying to cast Ice Shield, which you didn't unlock yet :)  I wanted to make the loop detection logic more lenient, but ran out of time!

Thanks! We want to improve the circle detection to make it easier in a future version