Maybe depends on browser or system (tested on windows8.1-laptop with basilisk-browser), somehow if jumping close to the edge to some wall-blocks, with the up-arrow on my keyboard, my protagonist somehow jumps into the opposite-direction than just upwards?
If touching a left/right wall and jumping, even those walls get destroyed if never stepped into them so far either.
At least for graphics and downloads, I guess my device would lag in space in that case, while I like that this game is available as webversion & I like the main-screen's image, especially those clouds. Also cool title and banner, never played many games including a rhino yet.