Hello! Welcome to Feedback Quest 7! My name's Hythrain and I'm one of the hosts and one of the streamers for this event! This feedback is being written live as I stream your game! If you're interested in seeing my live reaction, let me know and I can send you a link to the VOD once it's posted to YouTube!
So my normal approach for any game in these events is simple: I get the game, make sure it's not a virus, then play it with as little information on how to play as possible. This way, I can judge how intuitively someone can figure out the game. Only if it's obvious that I need to read more will I do so. I note this so you can get a sense where some of these feedback comes from. In addition, I want to note that feedback and rating are different; don't use this feedback to gauge what I'll rate, nor should you view my rating as entirely indicative of my feedback.
When I first realized what this game was, I was all "oh, ok, cool! This is kinda interesting!" Then as I played, I realized how stressful this was gonna get. XD
The core gameplay is solid and easy to get. I think the only things that came to mind for me that could be looked at were the water pausing while recharging and not losing fuel from hitting the sides. Note that I said could because I don't see either of these as critical. They're personal preference.
That said, I think my only real issue is with the minimalist style. A block running from red water that recharges in green water. A bit strange for me. If you were to try and do more with the visuals, though, I can give a suggestion.
Upon finishing the game, I noticed you had posted specific questions on the game's page! So allow me to answer those questions.
To begin, you asked about changing the colour theme for all segments. My answer is that this depends on if you're going to tell the player what segment they're on. If not, then you should change the colour theme. That way, THAT acts as an indicator of what segment they're on. However, if you intend to use another method of telling the segment that you think would be better, then you can keep the same colour theme throughout.
As for obstacles, this depends on how the player is supposed to view gameplay. Most of my ideas work with a top-down view. To start, you could have "holes" to fall through. You could also do patches where you lose fuel similar to the red, but likely not as much. In a similar vein, you could do ice patches where the player has even less control. Of course, this doesn't seem to be the view you're going with, given that you've described using "falling spikes."