Good controls. I like it. Even though you stick to the side-walls and can jump from there, it felt like part of the game.
But while definetely sticking to the summoning theme, I felt the game was a bit empty. After the first few letters, it got quite boring.
There's the problem of collecting 'T' twice, if you don't approach it carefully. And that the jump is affected if you're running on a slope. I guess you already know these.
But, all in all, a good experience. Keep it up! Maybe you could have added some enemies or something(that the demigod must destroy).