Fun vampire survivor clone. The bow is easiest, but the sword has a higher skill cap and is necessary for the lategame when it gets so laggy the red guys just huddle up in groups and don't move. Similar to vampire survivor, its best to pick new abilities that you want in your kit if you have the chance, in order to lock them in.
Fleet footwork is the most important ability, both early and late. Early it allows you to kite better and level faster. Late it allows you to level at all, without it you won't be able to pick up many gems. However, in the extreme late game when it gets laggy, the move speed is actually a nerf as it makes it harder to control your character. I build both Giant and Heavy Armor to offset the move speed. Finally, I pick Concentration as I think that will improve your DPS the most.
I got to 111382 at 10:20 with Fleet Footwork, Heavy Armor, Giant, and Concentration.
Although Light Armor is very strong in the early game, the move speed nerf lategame is too much. Range is probably the most important dps ability, so for that reason Relentless is a good dps ability, but weaker than Concentration imo. Similarly, Fast Reflexes is actually pretty bad because of the nerf to range. Berzerk and the other attack speed abilities are mid. Not bad, but I wouldn't consider them competetive with only 4 slots.
I don't know if this is a bug, but at some point it would only roll be a very limited set of options (basically berzerk and food). After refreshing I got normal rolls. I started refreshing in between each round in order to reset the rolls.