Very creative :D The screaming sound effect reminded me of an old flash game I used to play :D. Like some people already said, I would like some more juice for the stone, the laser felt great tho!
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It’s basically a mix of low-poly models and post-processing shaders. I render the game at a low resolution, 640x360 (or you can just use a pixelation shader), then upscale it and add stuff like film grain, dithering, color reduction and a jitter filter. The models are also low-poly with pretty simple textures. Most of them are just noise textures with albedo and normal maps (some also use roughness and metalic).
So basically it’s low-res rendering + low-poly assets + a few shaders layered together.