A really cute game! Great job predicting user behaviour / questions with the tutorial signs (I really thought the gun was a spring to let you jump higher at first until the sign with shooting instructions haha).
I also had some trouble with the spike area which would have worked if the difficulty level of the rest of the game was the same but continuously dying there considering the rest wasn't too bad was a bit of a bummer. Maybe adjusting the length of the second row of spikes to give the player more room to start the jump would be good!
(Also I was so curious about the areas I couldn't get into just off screen! Not sure if there was a secret to exploring those or if it was just set decoration but they got my attention haha)