Bought your game and played about a hour worth, impressions below:
The VR is really well implemented. The scale is on point, the organisms look very large and chases can be pretty darn intense due to the 3D effect. As far as comfort goes, with all the spinning and turning you do you would think nausea would set in rather quickly, but I had very little problems while playing (the only time I felt ill was when I was playing in the calibration sample of all things. The words on the panels kept reminding me I was spinning like crazy in the game, which didn't sit well with me).
My main problem comes with the actual gameplay. I enjoyed the VR experience greatly, but I can't say I was having much fun playing the actual game. The levels were nice and big but my hour of just collecting energy balls and dodging organisms gave the impression of an experience that could become tedious and shallow after a few more hours of gameplay. Maybe the locked levels upon up the gameplay a bit more?
Overall, the VR experience of VEV alone is well worth the $4.99 asking price. I'm just not sure if the gameplay is there to back it up, but few other games have immersed me in their VR world like VEV did.
Side note: I was so immersed in VEV that my dog chewed through the protective barrier of my VR headset cable. Thankfully I caught her before she got the actual wiring, but damn if that didn't scare the hell out of me.