hi martenfur, the controls scheme of tetrible is actually what you’ll find most commonly for web versions of t*tris, such as t*tris.com or freet*tris.org.
you seem to be more used to jstris or maybe the switch controls of t*tris 99. fortunately, you’ll find that you can remap the controls of tetrible by simply pressing their name on the left hand side menu.
have fun 😉