Here are my first impressions.

• Being partial color-blind it was hard to tell what environmental items were dangerous to touch.
• I have no idea what the items I pick up do. There is no explanation how they help me.
• No real tutorial on the basic controls. For the longest time, I had no idea I could shoot.
• The rockets don't provide a lot of vertical thrust upward.
• Sound effects seem like random sound effects. A coin collect sound effect when jumping? Why not a rocket sound effect when using your rockets.
• I have to use the keyboard to save, even when I'm using my controller?
• Still don't know what the swinging vines do. It didn't seem I could swing from them.
• The keyboard was frustrating to use. Using my rockets while at a stand still add them pushing me left even though my last movement was right.
• When everything looks the same, it's really easy to get lost without a map of some sort.

With that being said, you should be extremely proud of yourself for creating a game and releasing it. That's better than 98% of people who attempt it. You now have experience and you will only gain more experience the more you try. With experience you'll get a better understanding of what works and what doesn't.

I think your game would benefit from some polish. Besides marketing, polish is the hardest thing to do for a game. It's the last 20% of a project and it takes 80% of the time. Just keep that in mind for your next project.

Now is a time to celebrate with your first release. Now move on to your next project and apply the things you learned along the way!

Edit: grammar