I just died on level 7 (with the T that shoots periods) and when i got sent two rooms back (LV.B? Just before the Z-shooting P) where you have to walk towards the A, the screen wasn't cleared and the T and two dots were still there. Not a big deal, just thought you might want to know. Otherwise it's really nice, though i have to say that the spaced text is a bit odd It might look better centered.  You can also hit the B's with your sword and it'll disappear (or at least in LV.7), at first i was afraid that i'd destroyed it

Another thing you can do is quit on LV.8 and pick up a lot of 1-ups. I guess the max is 10. Later when you die it looks like you've got 90, 80, 70, etc.

And like DJ, the first boss was hard. I guess you've got to just keep moving, but it's hard to see their bullets.

I think i just beat it, was the last level the one with the two M's? They didn't move or anything, so i'm not sure, but it just said i beat the game. It was fun, though a bit confusing at times. Nice job

Yeah, you beat the game. Thanks!
* 123outerme runs
Yeah, I was planning on adding a few secrets to the levels, so I'll fix the problem with Lv. B (the bridge level, hence the B) as well.
As for the spaced text, that was done so that it coculd remain compatible with the +C, since the Text( command's way of counting is different on there.
As for the chests ("B"), I'll make sure that they refresh so that they never disappear.

Edit (2): Version 1.2 uploaded, it has the fixes to the bugs (Lv. B thing and the 10 lives thing) described above, along with a secret.
Edit 3: Please tell me if you kill both enemies in Level 9, and walk, but it doesn't give you the artifact.
Also, forgot to make the "B"s refresh
Edit 4: I saw what's wrong with Level 9 and I fixed it (hopefully)
Working on making the "B"s refresh so you can't "destroy" them, and I will reupload it once I'm done. I'll post when I do.

As for the secret thing, it's something invisible on the ground somewhere, but not on a boss fight level, so don't bother looking there.
If you encounter any strange activity (Level 9 not letting you have the artifact after killing the enemies AND walking around, bugs, glitches, errors, etc.), please tell me and I will do my best to fix it.
Just to reiterate that point again, if Level 9 doesn't let you get the artifact after killing the enemies, take a step in any direction and that should fix it. This is due to the way that the engine (that I made) works.

Wow those were fixed fast! If you want, i can take some animated screenshots for the 83+ version (i don't have a CSE). The game is surprisingly fast, though, nice work

Your anagram was easy.

Now that you say that, I have the urge to hack the game

But I don't think I can

That was my plan, but I don't think the game would fit with all the other assorted stuff on my calc. Is it mirage OS compatible?

I think this is the first pure BASIC game that runs on both the monochrome and color calcs, so you got that going for you which is nice. And cool.

Nah, I got it. Uploading these fixes in a minute: