How about having new weapons or helper bots at the end of a upgrade tree like at the end of the bow you can get a single bow helper but you lose your bow to him? the possibilities are endless.

back to new weapons you could have meany different ones or two swords for example?

yes exactly the are endless possibilities

You could have a healing up grade for one time then you can get a bot like DomDropsBombs pointed out as a next upgrade.

OMG you could have a upgrade that you can capture a sword,bow,or jet pack but you have to have a all other upgrades first sort of a reword for getting that far but only on or one at a time so they can diy?

leave a idea if you have on even if it is out of the ordinary or op because people can tweak it or if it a resonable idea we all can bild apon it

if you have one /\

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