Well, I can see you tried and some of the dialogue is more interesting. I think you just need more practice.
Todays tip: Actually this is going to be a multitip day because I feel like sharing.
Your character lacks explaination for their actions. Im not really sure why he is just going around stabbing people. Also continuity it is your friend, I know it's bothersome but if you draw a lamp in one panel you shouldnt avoid drawing it again in the next panel just because you're tired of drawing lamps.
Your character has a face (infact that's just about all he has) so you should really practice and work on facial expressions. It'll really give your character personality and assist in the tone of the dialogue.
I really wanted to talk about pacing, in this tip but I got carried away. You are the god of your comic. You can control everything to reader sees and also the way they are reading the dialogue. Use that to your advantage to create mood and control the beat of your comic.
For example this is what you had:
All the dialogue is mushed together, and your character is just randomly saying something to the globe without cause.
Here's how I streamlined it: (apologies paint is all I had to work with and i couldn't figure out how to center the dialogue)
So the break down!
Panel 1: I tossed the lamp because you work with minimum backgrounds and the lap is not important. Instead I brought in the globe which IS important. I also have the character looking at the globe since in my next panel the character is going to interact with the globe. I streamlined the dialogue so it seemed a little more natural and was easier to read. Then I used ellipses to slow... the reader... down. It made the character seem distracted by something.
Panel 2: Facial expressions! You dont have alot to work with character wise so flaunt what you got. I changed "I hate you." to "Im on to you." because it makes the character seem more suspicious and crazy, that way when he randomly stabs someone atleast there's a sliver of reason behind it. I made a drippy-fancy word bubble because I think it conveys tone better. Some people dont particularly care for them because they seem distracting so that's a matter of preference.
Panel 3: The globe is still with us, this time the character is beating the crap out of it further enforcing that he is crazy. I changed up the dialogue a bit more to seem more natural.
If this were my comic I would probally go through a few more revisions before putting out the final comic.