Sorry, I didn't think about that drop; I added it to my TODO list and I'll have it fixed by the next update! If you want a (very crappy) solution for the mean time, try closing your eyes for a few seconds after you die or win the round so you don't see the slight drop when you respawn.
Luckily I don't seem to get nausea from VR anymore so it's easy for me to forget about these sorts of things. Feedback like yours is very useful to make sure I make a game that everyone can play.
Thank you! Please let me know if you notice anything else in upcoming updates.