The first time it sent me into space I really laughed.
The mechanic is clever.
Unfortunately I think some bugs made it hard to play (for example, if I managed to send the other horse flying, the game would just stop).
I don't know if it was a bug but just finally when I felt like I understood the controls, suddenly there were two enemy horses and all hope was lost. If it is a bug it should be a feature.
I don't know how to get to the space bar when using the mouse and the arrow keys, so different controls might be better.
The novel stack of haxego and externs is really exciting.