OK, I've played Xeia now. Below are a some hints to help with your question. The walkthroughs give too much away when all you're looking for is a hint.

I'm stuck and could really use a hint to get me moving forward again. It feels like I've retraced my steps so many times that I've made paths in the ground, and even ruts in the sand at the bottom of the sea! 

I have all of the powerups except the eye. I also have the swim mask, all of the pink flowers, 5 gold Junis, 19 coins and 35 gold creatures.

I have no keys, but know where the yellow, blue and red ones are. I can't get the yellow key yet as I need to "collect 2".....2 gold Junis?

This is a great level! You have put a lot time and effort into creating it. Thank you Purple Ink! I love that it's not just exploration with pretty screens, although those levels can be very enjoyable. It is exploration with awesome screens AND a challenge to find all of the secrets. Thanks also for including a -M- map. It's especially helpful with big levels where you can feel overwhelmed trying to remember where you have and haven't explored.

Again, some hints would be very much appreciated to nudge me along, i.e. a hint for the location of the eye. 

I'm stuck and would really appreciate a hint that could get me moving forward again.

I have all of the powerups except the eye. I also have the swim mask, all of the pink flowers, 5 gold Junis, 18 coins and 35 gold creatures.

I have no keys, but know where the yellow, blue and red ones are. I can't get the yellow key yet as I need to "collect 2".....2 gold Junis?

This is a great level! You have put a lot time and effort into creating it. Thank you Purple Ink! I love that it's not just exploration with pretty screens. It IS exploration with awesome screens AND the challenge to find all of the secrets.

Again, hints would be great to nudge me along. 

Thank you for giving it a try! 

I'm really enjoying your level so far. It's creative and well-organized. Also, great job on capturing the retro feel! 

I've been looking around for the high jump. Is it included in the level?

I am really enjoying this level. But now I'm stuck after meeting Karel. He told me to journey to the clouds and gave further instructions. I have tried several locations, but don't know where the journey to the clouds should take me before I follow his instructions. Please tell me where I should go in the clouds.

I'm enjoying this maze very much and have made it to the second, more colorful, area. Is this new, colorful area only one screen? I'm stuck and can't find a way to leave it.

Thanks for the new levels you have uploaded! This is the first I've played so far.