I like the idea. Some things I'd change
- hide the healthUI, if the hearts are not important
-more explanation would help. Imo would be nice to come up with a "story" why you can see it and why not. For example, that you have special glasses, that can see the spikes, but the contact on the battery isn't working properly and the glasses are turning off and on randomly.
- The box imo should crash the spikes, not just go over them