Nice idea but the game requires some polish.
- The dog takes a few hits to be killed. Add a damage indicator.
- The jump is weird. If I hold the SPACE down while in the air and land on a platform, when I release the SPACE bar I jump again. Make the jump happen only when you press the SPACE bar, not when you release it.
- A death animation would be nice.
- Use the UP-arrow or W for jump. I do not understand why there needs to be a different button for jumping.