ha ha, hearing feedback feels so nice. Thanks for the comments.
Anyways, to reply to both isteinvids and wesley.laferriere, the reason I didn't put this in WIP is because my school just started, so I doubt I'll be working on it for a long time. So unfortunately, I won't be able to add physics anytime soon. But I am curious what you (weasley) had in mind? springs and dynamic cloth and electronics and optics and such would be way over my head. as for simple gravity and collision detection, it does exist, but only for blocks that have it enables (kind of like sand/gravel in minecraft). so if you use the 1st tool to throw blocks, it does have air-friction and gravity. if you use the 3rd tool (the exploding block one), the blocks that fly away after the explosion also have air-friction and gravity, but the physics is disabled once their velocity falls below a certain threshold (It should have checked acceleration too to avoid blocks that get stuck in midair, but I'll fix that next update).
i did not use external libraries, but if you were to decompile and look at the source code, you'll see there is an incomplete hardware accelerated version that uses libgdx.