[pents90]

(Author here) The apps are just really thin native WebView/UIWebView layers, included in the source. No frameworks were used.

[knome]

You may want to consider standard WASD for directions, moving back to Q, select to E and special functions to ZXC. The WASD habit is strong, for me at least.

Not that it will matter as much for the end app, of course.

[djent]

I'm used to HJKL for movement.