[Indie Game] ReactionLab - A pixelated particle sandbox reminiscent of 'falling-sand', only better!

It's a fast, pixelated particle simulation game similar to 'falling-sand' if you've ever played that. Essentially you draw various 'elements' onto a canvas and watch them interact in real-time. It's got 40+ elements and a variety of different achievements to give the game some direction. There are endless possibilities to what you can create!

Gameplay trailer:

Check it out on Google Play; free version available!

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Screenshots:

I would love to know what you think!