I really like the music and sounds in this game. The idea is also quite interesting and I enjoyed the athmosphere. I can't confirm the performance issues, the game went fluent on my side. Only thing.. the part of when the second dog is coming.. it might sound dumb but I tried various times and it just felt impossible to pass it. The dog anyway comes quite fast. Above that the path was very narrow and I didn't manage to escape. Now not sure if the dog events are fixed (always at the same spot?) or if dogs come by coincidence.. Anyway, finally I gave up at that part. If there's a trick behind, you maybe want to consider telling the player after he is caught (or after he was cought a certain amount of times. If not, then maybe reconsider the spot.
As for the grammar and spelling, Naomi is right. I'd just ask a native speaker to proofread it.