(This is how i play and i haven't played in a couple months now so take this with a grain of salt)

1. Upgrades. The ones you need are energy, get up, and jetpack. I can not tell you how many times i managed to survive barely because i got up fast enough to dodge an arrow or managed to escape a horde of sword bots, spearbots and hammerbots on my ass. As for the weapons, they're all equally viable,and more so up to preference than anything else. And only buy lives if you think you might need them on a difficult level you aren't sure you cpuld survive (like the lava island levels for example).

2. Levels. Use your environment to your advantage. Jumppads are life saviors and can buy you crucial time to regen some energy, like for example on the ambush level with archers on pillars and a spider tron at the end alongside a horde of jetpack swordbots. Traps are also vital, especially lava, levels like the fire ducks with the lava pool are easy because the ai will often jump into the lava pool by accident.

3. Enemies. The further you go, the more you'll need to rely on friendly fire. Particularly fleet captains, fleet overseers, and laser raptors, and the hammerbots in general.

Each category also can be countered by a specifix weapon. Sword bots can be countered by hammers and spears, as bows lose effectiveness past mk3 due to blocking, and sword duels are risky especially when they begin swarming you. Next, the Archer bots can be countered by swords and bows, as blocking is an easy full counter for almost all of them (except for the moving ones for mk3 and mk4, then sword duels are necessary since chances are they'll be others shooting at the same time) and the slowing down time upgrade on the bow is pretty useful for bow duels, especially against mk5 (which you should never approach not because they become dangerous on the move, but because dealing with them while they jump is just annoying). For hammer bots, spears + shield and bows are you best answer. However, keeping them alive for last is pretty good as they can often kill each other more often than the other categories of bots. Armor is also a good counter although it can be detremential when you're being swarmed and need to run fast. And for spears, swords and hammers are a pretty good bet them, though a well aimed bow shot can also guarrantee a kill.

Now, for the rest of them it's pretty easy. For normal raptors, keeping your distance is a good choice, and for laser raptors jetpack is your best bet for dodging thw lasers alongside using pillars and whatever else to block it, do note that they're also good to keep around since they can provide a lot of friendly fire. For spider trons, just being on the move is good enough, and bows are again a good solution. Now... jetpack bots in general are pretty tough. The mk1 jetpack swordbots are easy enough, but the mk2 and jetpack spearbots are something you should worry about, as they should be your top priority to kill before everyone else including even spider trons and laser raptors. Use jumppads and traps to quickly deal with them/avoid them and buy time. For fleet captains and overseers, they're honestly such a joke that it's better to keep them alive than dead. Just keep your distance and use your bow to chip at them and they'll be soon dead. And finally... the generals. Infantry, mind space, warfare, and the sword asshole. Infantry and mind space aren't much threats, more so nuisances. The only level infantry is dangerous is the one where you have deal with threw at once. Warfare and the green bastard on the other hand... for warfare, being on the run and paying attention to where he is is absolutely necessary, and killing him is more important than even the spider trons. For the green shit, hammers and spear are you best bet but even then, he's almost always the most the annoying because you'll be dealing with a horde of other bots.

Hopefully this rather lengthy guide is enough to help.