This is great. Would it be okay to use this? I'm pitching an animated series and would love to use this as the official theme tune. We can talk about it more if you want?

Liam!

I really like it, I definitely feel "pressure" like another reviewer, but it's calm and easygoing enough to be used in a strategy-oriented game. Not quite "boss battle" but more like "midboss", which is a really good thing.

catchy tune, its totally donkey kongish xD

Oh, I like your intro! :) Loops perfectly, too. I think your drums and bass go perfectly together. I love at 0:40-0:43 where you hold the strings for a bit. Bringing the bass back in there just afterwards with that low string hum sounded really great. 1:25 is also another great part, where your sounds just mesh very nicely.
As for the mood, I think this did sound more pressure than happy. Not necessarily bad pressure...but pressure nonetheless. The combination of repetitive, fast-moving bass along with the onset of the string melody at 0:25 is probably responsible for that.
Overall, I think you did do well! As long as it fits the setting you're aiming for, then I think that's what counts the most. :)