I highly suggest making it click to shoot not E, since one finger is used to press D (move right), E and R making it feel pretty clunky. I like the look of the dice indicator though.

The idea of reload bullet depending on the dice roll is really interesting!

Now the control and the design not help to make it appealing

As already said by the previous commentary : 

physics need to be improved, and I will be more extreme : don't do  jump button or even movement button if it is not necessary (or already said meaningful).

When I played, I only use reload and fire :p

An idea : If the game put the character at the center of the screen, static, and made enemies appeared from the left and the right, the player would have more option and more decision to make without creating you more work to be done.

But as already said (yes i repeat a lot :p) good job for finishing something, and good job for having one good design idea to work with.

interesting variation on the infinite runner genre.

some constructive criticisms:

the jump is really floaty. i would increase the gravity a bunch.

also, variable jump height would add a lot to a game like this. it can be pretty hard to implement, but a system i like is to apply a downward force when you release jump based on how long you help jump for.

enemies also move really fast for me. maybe slow them down a bit at the start.

also, the roll button doesn't need to be in the game. i would make it automatically roll when you finish your bullets. right now, its just another thing to worry about.

i think if you want the player to be able to move left and right, you need to make it meaningful. i think right now, the only reason you would move left and right is to account for how floaty the jump is. theres two paths you could take: you could lock the player in place like an infinite runner, or you could add some other mechanic that incentivizes the player to move.

anyways:

good job on releasing something, its not as easy as most people think!