My concern is that I don't really feel any different between level ups. I don't know if this is because it's EA or if that's how 5E is, but it just feels like an HP bump and not much else. Combat and leveling hasn't felt very fulfilling for me so far.
It really depends on what class you’re playing, but generally 5E levels are pretty impactful. Here are some examples:
Full casters get a new level of spells at any odd level.
Fighters get action surge (can take two actions in a turn once per short rest) at level 2
Warlocks get invocations at level 2, agonizing blast invocation greatly increases eldritch blast damage.
Most classes get an archetype at level 3 which is huge.
There’s a lot more than that, you probably just don’t notice this because you’re not familiar with the system.