Neat! I like how it feels like a tower defense game in-and-of itself where your structures are dealing with their structures. I might try to make the walls last a bit longer, only because I found the strategy of just alternating shield and speed spells was a pretty efficient way to keep all four orcs alive until the end. I feel placing walls strategically was more fun, so it might be something you want to make more effective.

Neat concept! It would've maybe been better if you could place down the powerups before the orcs came, but I still liked all the main gameplay elements.

Cool game. Good presentation, and clean visuals and sound.

Reminded me a bit of the old flash game multitask, where you have to remember to manage several tasks.